Photographing module and electronic device

ABSTRACT

A photographing module includes an imaging lens assembly. The imaging lens assembly includes a plurality of lens elements, wherein one of the lens elements is a plastic lens element. At least one surface of an object-side surface and an image-side surface of the plastic lens element includes an effective optical portion and a peripheral portion. The peripheral portion surrounds the effective optical portion, and includes a plurality of rib structures, a first fitting section and an isolation section. Each of the rib structures has a strip shape along a radial direction of an optical axis of the imaging lens assembly, and the rib structures are arranged around the effective optical portion. The first fitting section surrounds the effective optical portion, and is connected to another one of the lens elements adjacent to the surface. The isolation section is disposed between the rib structures and the first fitting section.

RELATED APPLICATIONS

The present application is a continuation of the application Ser. No.15/996,769 filed on Jun. 4, 2018, which is a continuation of theapplication Ser. No. 15/155,160, filed on May 16, 2016, U.S. Pat. No.10,018,808 issued on Jul. 10, 2018, and claims priority to Taiwanapplication serial number 105202129, filed on Feb. 5, 2016, the entirecontents of which are hereby incorporated herein by reference.

BACKGROUND Technical Field

The present disclosure relates to a photographing module. Moreparticularly, the present disclosure relates to a photographing modulewhich is applicable to portable electronic devices.

Description of Related Art

Due to the popularity of personal electronic products and mobilecommunication products having camera functionalities, such as smartphones and tablet personal computers, the demand for compactphotographing modules has been increasing and the requirements for highresolution and image quality of present compact photographing modulesincrease significantly.

A plastic lens element is generally used to effectively reduce themanufacturing cost of the photographing module. A conventional plasticlens element is typically formed by an injection molding method and hasa smooth and bright surface, which is featured with high reflectivity.Accordingly, when the stray light is reflected from the surfaces ofother optical elements of the photographing module to the surface of theplastic lens element, the stray light reflected from the surface of theplastic lens element cannot be effectively attenuated and would beincident on the surfaces of lens elements of the photographing module.

Furthermore, the compact photographing module typically includes aplurality of plastic lens elements so as to enhance the image quality bythe plastic lens elements featured with compact sizes, aspheric surfacesand sharp changing of curvatures. However, lens elements with compactsizes and aspheric surfaces often result in alignment problems amonglens elements. To solve the problems, the technology of lens elementswith the inserting structures has been developed to improve theprecision of axial installation. But the complexity of the insertingstructures increases the difficulties of stray light control and itbecomes worse when the photographing modules have compact sizes.

Given the above, how to simultaneously meet the requirements ofsuppressing the stray light of the compact photographing module andalignment precision with the optical axis of the lens elements hasbecome one of the important subjects, so that the image quality of thecompact photographing modules can be enhanced, and the requirements ofhigh-end optical systems with camera functionalities can be satisfied.

SUMMARY

According to one aspect of the present disclosure, a photographingmodule includes an imaging lens assembly. The imaging lens assemblyincludes a plurality of lens elements, wherein one of the lens elementsis a plastic lens element. At least one surface of an object-sidesurface and an image-side surface of the plastic lens element includesan effective optical portion and a peripheral portion. The effectiveoptical portion is aspheric. The peripheral portion surrounds theeffective optical portion, and includes a plurality of rib structures, afirst fitting section and an isolation section. Each of the ribstructures has a strip shape along a radial direction of an optical axisof the imaging lens assembly, and the rib structures are arranged aroundthe effective optical portion. The first fitting section surrounds theeffective optical portion, and is connected to another one of the lenselements adjacent to the surface for aligning the plastic lens elementwith the lens element adjacent to the surface. The isolation section isdisposed between the rib structures and the first fitting section. Whena number of the lens elements of the imaging lens assembly is N, thefollowing condition is satisfied: 4≤N.

According to another aspect of the present disclosure, an electronicdevice includes the photographing module according to the foregoingaspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic view of a photographing module according to the1st embodiment of the present disclosure;

FIG. 1B is a schematic view of the plastic lens element according to the1st embodiment;

FIG. 1C is a schematic view of the parameter w of the plastic lenselement according to the 1st embodiment;

FIG. 1D is a schematic view of the parameters t and θ of the plasticlens element according to the 1st embodiment;

FIG. 2A is a schematic view of a photographing module according to the2nd embodiment of the present disclosure;

FIG. 2B is a schematic view of the plastic lens element according to the2nd embodiment;

FIG. 2C is a schematic view of the parameter w of the plastic lenselement according to the 2nd embodiment;

FIG. 2D is a schematic view of the parameter θ of the plastic lenselement according to the 2nd embodiment;

FIG. 3A is a schematic view of a photographing module according to the3rd embodiment of the present disclosure;

FIG. 3B is a schematic view of the plastic lens element according to the3rd embodiment;

FIG. 3C is a schematic view of the parameter w of the plastic lenselement according to the 3rd embodiment;

FIG. 3D is a schematic view of the parameter θ of the plastic lenselement according to the 3rd embodiment;

FIG. 3E is a schematic view of another plastic lens element according tothe 3rd embodiment;

FIG. 3F is a schematic view of the parameter w of the another plasticlens element according to the 3rd embodiment;

FIG. 3G is a schematic view of the parameters t and θ of the anotherplastic lens element according to the 3rd embodiment;

FIG. 3H is a schematic view of the other surface of the another plasticlens element according to the 3rd embodiment;

FIG. 3I is a schematic view of the parameter w of the other surface ofthe another plastic lens element according to the 3rd embodiment;

FIG. 4A is a schematic view of a photographing module according to the4th embodiment of the present disclosure;

FIG. 4B is a schematic view of the plastic lens element according to the4th embodiment;

FIG. 4C is a schematic view of the parameter w of the plastic lenselement according to the 4th embodiment;

FIG. 4D is a schematic view of the parameters t and θ of the plasticlens element according to the 4th embodiment;

FIG. 5 shows an electronic device according to the 5th embodiment of thepresent disclosure;

FIG. 6 shows an electronic device according to the 6th embodiment of thepresent disclosure; and

FIG. 7 shows an electronic device according to the 7th embodiment of thepresent disclosure.

DETAILED DESCRIPTION 1st Embodiment

FIG. 1A is a schematic view of a photographing module 1000 according tothe 1st embodiment of the present disclosure. In FIG. 1A, thephotographing module 1000 includes an imaging lens assembly 1100. Theimaging lens assembly 1100 includes a plurality of lens elements,wherein one of the lens elements is a plastic lens element 100, and atleast one surface of an object-side surface 101 and an image-sidesurface 102 of the plastic lens element 100 (the aforementioned surfaceis the object-side surface 101 in the 1st embodiment) includes aneffective optical portion 111 and a peripheral portion 121.

The effective optical portion 111 of the plastic lens element 100 isaspheric, wherein the incident light passes through the effectiveoptical portion 111 and forms the image on an image surface (not shownherein). The peripheral portion 121 surrounds the effective opticalportion 111, and includes a plurality of rib structures 131, a firstfitting section 151 and an isolation section 141.

FIG. 1B is a schematic view of the plastic lens element 100 according tothe 1st embodiment. In FIG. 1A and FIG. 1B, each of the rib structures131 has a strip shape along a radial direction of an optical axis of theimaging lens assembly 1100, and the rib structures 131 are arrangedaround the effective optical portion 111. Therefore, it is favorable formeeting the requirements of suppressing the stray light of thephotographing module 1000. Furthermore, the cross-section in the radialdirection of the optical axis of each of the rib structures 131 can be atriangle, a rectangle or a polygon. In the 1st embodiment, thecross-section in the radial direction of the optical axis of each of therib structures 131 is a rectangle.

In FIG. 1A, the first fitting section 151 surrounds the effectiveoptical portion 111, and is connected to a lens element 1101 adjacent tothe object-side surface 101 for aligning the plastic lens element 100with the lens element 1101. That is, the plastic lens element 100 andthe lens element 1101 can be aligned with the optical axis of theimaging lens assembly 1100. Therefore, it is favorable for meeting theprecision requirements of axial installation of the photographing module1000.

The isolation section 141 is disposed between the rib structures 131 andthe first fitting section 151. There is an air gap between the isolationsection 141 and the lens element 1101, and there is another air gapbetween the isolation section 141 and a light blocking sheet 1191.Therefore, it is favorable for maintaining the assembling accuracy ofthe plastic lens element 100 with the rib structures 131. Furthermore,the rib structures 131 can be avoided too close to or extending to thefirst fitting section 151 by the isolation section 141, and the spaceaccommodating the rib structures 131 and the light blocking sheet 1191can be also maintained by the isolation section 141 so as to preventcollisions. In other embodiments (not shown herein), when two surfacesadjacent to each other of two lens elements respectively both includethe rib structures, the isolation section can prevent the two lenselements from collisions and interference after assembling.

When a number of the lens elements of the imaging lens assembly 1100 isN, the following condition is satisfied: 4≤N. Therefore, it is favorablefor simultaneously suppressing the stray light and enhancing alignmentprecision with the optical axis so as to satisfy more photographingrequirements such as video, high dynamic range (HDR), imaging operation,optical zoom, fast focusing and the like. Preferably, the followingcondition can be satisfied: 5≤N. More preferably, the followingcondition can be satisfied: 5≤N<10. In the 1st embodiments, the imaginglens assembly 1100 includes, in order from an object side to an imageside, the lens elements 1101, the plastic lens element 100, lenselements 1102 and 1103. The imaging lens assembly 1100 has a total offour lens elements. In other embodiments (not shown herein), the imaginglens assembly can have a total of five, six, seven or more lenselements. Furthermore, the imaging lens assembly 1100 including theplastic lens element 100 can be disposed in a barrel (its referencenumeral is omitted) so as to block a lot of stray light. It is favorablefor avoiding the stray light entering the portions of the lens elementother than the effective optical portion and preventing from unnecessaryreflection among the lens elements.

In detail, the rib structures 131 can be closer to the effective opticalportion 111 than the first fitting section 151. Therefore, it isfavorable for effectively blocking the stray light of the peripheralportion 121 near the effective optical portion 111.

In FIG. 1B, a number of the rib structures 131 can be greater than orequal to 80, and smaller than or equal to 480. Therefore, it isfavorable for maintaining the denseness of the rib structures 131 andbalancing the manufacturability so as to reflect hardly. In the 1stembodiment, the number of the rib structures 131 is 180. The ribstructures 131 are divided into two groups, which are arranged in orderalong the radial direction of the optical axis of the imaging lensassembly 1100. That is, one group being near the optical axis and theother group being far from the optical axis are separated by a bend ofthe peripheral portion 121. A number of the rib structures 131 of eachof the two groups is 90.

FIG. 1C is a schematic view of the parameter w of the plastic lenselement 100 according to the 1st embodiment. In FIG. 1C, when a greatestwidth of each of the rib structures 131 is w, the following conditioncan be satisfied: 0.01 mm<w<0.10 mm. Therefore, it is favorable forenhancing the light diminishing of the photographing module 1000 by therib structures 131 with fine structures so as to diverge the straylight.

In FIG. 1A and FIG. 1B, each of the rib structures 131 can include alight diminishing surface 133. Therefore, it is favorable for improvingquality stability of molding of the plastic lens element 100.Furthermore, the light diminishing surfaces 133 can be rough surfaces.The light diminishing surfaces 133 are transferred from the machiningproperties of the mold surfaces during the injection molding process,wherein the machining properties can be electrical discharge machining(EDM), sand blasting, laser related etching and the like. The lightdiminishing surface 133 can be located on every surfaces or a surfacefacing an imaged object (not shown herein) of each of the rib structures131, and the light diminishing surface 133 can be located on at leastpart of areas thereof. In the 1st embodiment, the light diminishingsurfaces 133 are rough surfaces and transferred from the electricaldischarge machining properties of the mold surfaces during the injectionmolding process. Each of the light diminishing surfaces 133 is locatedon all area of every surfaces of each of the rib structures 131.

When a surface roughness of each of the light diminishing surfaces 133is Ra, the following condition can be satisfied: 0.1 μm<Ra. Therefore,it is favorable for controlling the light diminishing level of the lightdiminishing surfaces 133.

The isolation section 141 can be a smooth surface, wherein thesmoothness of the isolation section 141 is the same as or similar to thesmoothness of the effective optical portion 111. Therefore, it isfavorable for maintaining the assembling accuracy of the first fittingsection 151.

The isolation section 141 can include an annular surface 143, wherein anormal direction of the annular surface 143 is parallel to the opticalaxis of the imaging lens assembly 1100. Therefore, it is favorable forreducing molding complexity of the plastic lens element 100.

In FIG. 1A, the plastic lens element 100 can be the second lens elementof the imaging lens assembly 1100 in order from the object side to theimage side. Therefore, it is favorable for reducing the white ghostimage outside the image surface. In the 1st embodiment, the imaging lensassembly 1100 includes, in order from the object side to the image side,the lens elements 1101, the plastic lens element 100, the lens elements1102 and 1103, wherein the plastic lens element 100 is the second lenselement of the imaging lens assembly 1100 in order from the object sideto the image side.

The imaging lens assembly 1100 of the photographing module 1000 canfurther include the light blocking sheet 1191 disposed between theplastic lens element 100 and the lens element 1101, which is adjacent tothe plastic lens element 100. Therefore, it is favorable for effectivelyblocking stray light among the lens elements.

FIG. 1D is a schematic view of the parameters t and θ of the plasticlens element 100 according to the 1st embodiment. In FIG. 1D, when athickness of the light blocking sheet 1191 is t, the following conditioncan be satisfied: 0.005 mm<t<0.05 mm. Therefore, it is favorable forreducing mechanical interference among the optical elements such as thelens element 1101, the light blocking sheet 1191 and the plastic lenselement 100 by the light blocking sheet 1191 with proper thickness.

When an angle between the first fitting section 151 and the optical axisof the imaging lens assembly 1100 is 8, the following condition can besatisfied: 5 degrees<8<35 degrees. Therefore, it is favorable formaintaining the compact size of the photographing module 1000, andobtaining the proper stress distribution required by the first fittingsection 151 aligning with the optical axis.

In FIG. 1A, the other surface of the object-side surface 101 and theimage-side surface 102 of the plastic lens element 100 (theaforementioned the other surface is the image-side surface 102 in the1st embodiment) can include a second fitting section 152 connected tothe lens element 1102, which is adjacent to the image-side surface 102,for aligning the plastic lens element 100 with the lens element 1102.That is, the plastic lens element 100 and the lens element 1102 can bealigned with the optical axis of the imaging lens assembly 1100. In the1st embodiment, the first fitting section 151 and the second fittingsection 152 are connected to the lens elements 1101 and 1102respectively for the lens element 1101, the plastic lens element 100 andthe lens element 1102 aligned with the optical axis of the imaging lensassembly 1100. Therefore, it is favorable for increasing the precisionand the stability of the axial distance between every two of the lenselements adjacent to each other.

When an Abbe number of the plastic lens element 100 is V, the followingcondition can be satisfied: 10<V<25. Preferably, the following conditioncan be satisfied: 10<V<22. Therefore, it is favorable for effectivelyreducing the chromatic aberration of the photographing module 1000.

The data of the aforementioned parameters of the photographing module1000 according to the 1st embodiment of the present disclosure arelisted in the following Table 1, wherein the parameters are also shownas FIG. 1C and FIG. 1D.

TABLE 1 1st Embodiment N 4 V 23.3 Ra (μm) 0.4~1.12 w (mm) 0.044 t (mm)0.016 θ (deg.) 20

2nd Embodiment

FIG. 2A is a schematic view of a photographing module 2000 according tothe 2nd embodiment of the present disclosure. In FIG. 2A, thephotographing module 2000 includes an imaging lens assembly 2100. Theimaging lens assembly 2100 includes a plurality of lens elements,wherein one of the lens elements is a plastic lens element 200, and atleast one surface of an object-side surface 201 and an image-sidesurface 202 of the plastic lens element 200 (the aforementioned surfaceis the image-side surface 202 in the 2nd embodiment) includes aneffective optical portion 212 and a peripheral portion 222.

The effective optical portion 212 of the plastic lens element 200 isaspheric. The peripheral portion 222 surrounds the effective opticalportion 212, and includes a plurality of rib structures 232, a firstfitting section 252 and an isolation section 242.

FIG. 2B is a schematic view of the plastic lens element 200 according tothe 2nd embodiment. In FIG. 2A and FIG. 2B, each of the rib structures232 has a strip shape along a radial direction of an optical axis of theimaging lens assembly 2100, wherein the cross-section in the radialdirection of the optical axis of each of the rib structures 232 is arectangle, and the rib structures 232 are arranged around the effectiveoptical portion 212.

In FIG. 2A, the first fitting section 252 surrounds the effectiveoptical portion 212, and is connected to a lens element 2101 adjacent tothe image-side surface 202 for aligning the plastic lens element 200with the lens element 2101. That is, the plastic lens element 200 andthe lens element 2101 can be aligned with the optical axis of theimaging lens assembly 2100.

The isolation section 242 is disposed between the rib structures 232 andthe first fitting section 252. There is an air gap between the isolationsection 242 and the lens element 2101.

In the 2nd embodiment, the imaging lens assembly 2100 includes, in orderfrom an object side to an image side, the plastic lens element 200, lenselements 2101, 2102, 2103, 2104 and 2105, wherein the imaging lensassembly 2100 has a total of six lens elements, and the plastic lenselement 200 is the first lens element of the imaging lens assembly 2100in order from the object side to the image side.

In FIG. 2A and FIG. 2B, the rib structures 232 is closer to theeffective optical portion 212 than the first fitting section 252. Anumber of the rib structures 232 is 90.

Each of the rib structures 232 includes a light diminishing surface 234.The light diminishing surfaces 234 are rough surfaces and transferredfrom the sand blasting machining properties of the mold surfaces duringthe injection molding process. Each of the light diminishing surfaces234 is located on all area of every surfaces of each of the ribstructures 232.

The isolation section 242 is a smooth surface, wherein the smoothness ofthe isolation section 242 is the same as or similar to the smoothness ofthe effective optical portion 212. Furthermore, the isolation section242 includes an annular surface 244, wherein a normal direction of theannular surface 244 is parallel to the optical axis of the imaging lensassembly 2100.

FIG. 2C is a schematic view of the parameter w of the plastic lenselement 200 according to the 2nd embodiment, and FIG. 2D is a schematicview of the parameter θ of the plastic lens element 200 according to the2nd embodiment. The data of the parameters N, Ra, V, w and θ of thephotographing module 2000 according to the 2nd embodiment of the presentdisclosure are listed in the following Table 2, wherein the parametersare also shown as FIG. 2C and FIG. 2D. The definitions of theseparameters shown in Table 2 are the same as those stated in the 1stembodiment with corresponding values for the 2nd embodiment.

TABLE 2 2nd Embodiment N 6 w (mm) 0.05 Ra (μm) 0.56~0.8 θ (deg.) 20 V21.4

3rd Embodiment

FIG. 3A is a schematic view of a photographing module 3000 according tothe 3rd embodiment of the present disclosure. In FIG. 3A, thephotographing module 3000 includes an imaging lens assembly 3100. Theimaging lens assembly 3100 includes a plurality of lens elements,wherein two of the lens elements are plastic lens elements 300 a and 300b.

First, the plastic lens element 300 a would be described. At least onesurface of an object-side surface 301 a and an image-side surface 302 aof the plastic lens element 300 a (the aforementioned surface is theimage-side surface 302 a of the plastic lens element 300 a in the 3rdembodiment) includes an effective optical portion 312 a and a peripheralportion 322 a.

The effective optical portion 312 a of the plastic lens element 300 a isaspheric. The peripheral portion 322 a surrounds the effective opticalportion 312 a, and includes a plurality of rib structures 332 a, a firstfitting section 352 a and an isolation section 342 a.

FIG. 3B is a schematic view of the plastic lens element 300 a accordingto the 3rd embodiment. In FIG. 3A and FIG. 3B, each of the ribstructures 332 a has a strip shape along a radial direction of anoptical axis of the imaging lens assembly 3100, wherein thecross-section in the radial direction of the optical axis of each of therib structures 332 a is a rectangle, and the rib structures 332 a arearranged around the effective optical portion 312 a.

In FIG. 3A, the first fitting section 352 a surrounds the effectiveoptical portion 312 a, and is connected to the plastic lens element 300b adjacent to the image-side surface 302 a for aligning the plastic lenselement 300 a with the plastic lens element 300 b. That is, the plasticlens element 300 a and the plastic lens element 300 b can be alignedwith the optical axis of the imaging lens assembly 3100.

The isolation section 342 a is disposed between the rib structures 332 aand the first fitting section 352 a. There is an air gap between theisolation section 342 a and the plastic lens element 300 b. Furthermore,when the image-side surface 302 a and an object-side surface 301 b ofthe plastic lens element 300 b, which is adjacent to the image-sidesurface 302 a, include rib structures 332 a and 331 b respectively, theisolation section 342 a can prevent the lens elements 300 a and 300 bfrom collisions and interference after assembling.

In the 3rd embodiment, the imaging lens assembly 3100 includes, in orderfrom an object side to an image side, the plastic lens elements 300 a,300 b, lens elements 3101, 3102, 3103 and 3104, wherein the imaging lensassembly 3100 has a total of six lens elements, and the plastic lenselement 300 a is the first lens element of the imaging lens assembly3100 in order from the object side to the image side.

In FIG. 3A and FIG. 3B, the rib structures 332 a is closer to theeffective optical portion 312 a than the first fitting section 352 a. Anumber of the rib structures 332 a is 120, wherein each of the ribstructures 332 a is V-shaped.

Each of the rib structures 332 a includes a light diminishing surface334 a. The light diminishing surfaces 334 a are rough surfaces andtransferred from the laser related etching machining properties of themold surfaces during the injection molding process. Each of the lightdiminishing surfaces 334 a is located on all area of every surfaces ofeach of the rib structures 332 a.

The isolation section 342 a is a smooth surface, wherein the smoothnessof the isolation section 342 a is the same as or similar to thesmoothness of the effective optical portion 312 a. Furthermore, theisolation section 342 a includes an annular surface 344 a, wherein anormal direction of the annular surface 344 a is parallel to the opticalaxis of the imaging lens assembly 3100.

FIG. 3C is a schematic view of the parameter w of the plastic lenselement 300 a according to the 3rd embodiment, and FIG. 3D is aschematic view of the parameter θ of the plastic lens element 300 aaccording to the 3rd embodiment. The data of the parameters N, Ra, V, wand θ of the photographing module 3000 and the plastic lens element 300a according to the 3rd embodiment of the present disclosure are listedin the following Table 3.1, wherein the parameters are also shown asFIG. 3C and FIG. 3D. The definitions of these parameters shown in Table3.1 are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment.

TABLE 3.1 Plastic Lens Element 300a of 3rd Embodiment N 6 w (mm) 0.033Ra (μm) 1.6~3.15 θ (deg.) 20 V 20.4

Next, the plastic lens element 300 b would be described. In FIG. 3A, atleast one surface of an object-side surface 301 b and an image-sidesurface 302 b of the plastic lens element 300 b (the aforementionedsurface is the image-side surface 302 b of the plastic lens element 300b in the 3rd embodiment) includes an effective optical portion 312 b anda peripheral portion 322 b.

The effective optical portion 312 b of the plastic lens element 300 b isaspheric. The peripheral portion 322 b surrounds the effective opticalportion 312 b, and includes a plurality of rib structures 332 b, a firstfitting section 352 b and an isolation section 342 b.

FIG. 3E is a schematic view of the plastic lens element 300 b accordingto the 3rd embodiment. In FIG. 3A and FIG. 3E, each of the ribstructures 332 b has a strip shape along a radial direction of theoptical axis of the imaging lens assembly 3100, wherein thecross-section in the radial direction of the optical axis of each of therib structures 332 b is a rectangle, and the rib structures 332 b arearranged around the effective optical portion 312 b.

In FIG. 3A, the first fitting section 352 b surrounds the effectiveoptical portion 312 b, and is connected to the lens element 3101adjacent to the image-side surface 302 b for aligning the plastic lenselement 300 b with the lens element 3101. That is, the plastic lenselement 300 b and the lens element 3101 can be aligned with the opticalaxis of the imaging lens assembly 3100.

The isolation section 342 b is disposed between the rib structures 332 band the first fitting section 352 b. There is an air gap between theisolation section 342 b and the lens element 3101, and there is anotherair gap between the isolation section 342 b and a light blocking sheet3191.

In the 3rd embodiment, the imaging lens assembly 3100 includes, in orderfrom an object side to an image side, the plastic lens elements 300 a,300 b, lens elements 3101, 3102, 3103 and 3104, wherein the imaging lensassembly 3100 has a total of six lens elements, and the plastic lenselement 300 b is the second lens element of the imaging lens assembly3100 in order from the object side to the image side. Furthermore, theimaging lens assembly 3100 of the photographing module 3000 can furtherinclude the light blocking sheet 3191 disposed between the plastic lenselement 300 b and the lens element 3101, which is adjacent to theplastic lens element 300 b.

In FIG. 3A, the other surface of the object-side surface 301 b and theimage-side surface 302 b of the plastic lens element 300 b (theaforementioned the other surface is the object-side surface 301 b of theplastic lens element 300 b in the 3rd embodiment) includes a secondfitting section 351 b connected to the plastic lens element 300 a, whichis adjacent to the object-side surface 301 b, for aligning the plasticlens element 300 b with the plastic lens element 300 a. That is, theplastic lens elements 300 b and 300 a can be aligned with the opticalaxis of the imaging lens assembly 3100. In the 3rd embodiment, the firstfitting section 352 b and the second fitting section 351 b are connectedto the lens element 3101 and the plastic lens element 300 a respectivelyfor the plastic lens elements 300 a, 300 b and the lens element 3101aligned with the optical axis of the imaging lens assembly 3100.

In FIG. 3A and FIG. 3E, the rib structures 332 b is closer to theeffective optical portion 312 b than the first fitting section 352 b. Anumber of the rib structures 332 b is 120.

Each of the rib structures 332 b includes a light diminishing surface334 b. The light diminishing surfaces 334 b are rough surfaces andtransferred from the laser related etching machining properties of themold surfaces during the injection molding process. Each of the lightdiminishing surfaces 334 b is located on all area of every surfaces ofeach of the rib structures 332 b.

The isolation section 342 b is a smooth surface, wherein the smoothnessof the isolation section 342 b is the same as or similar to thesmoothness of the effective optical portion 312 b. Furthermore, theisolation section 342 b includes an annular surface 344 b, wherein anormal direction of the annular surface 344 b is parallel to the opticalaxis of the imaging lens assembly 3100.

FIG. 3F is a schematic view of the parameter w of the plastic lenselement 300 b according to the 3rd embodiment, and FIG. 3G is aschematic view of the parameters t and θ of the plastic lens element 300b according to the 3rd embodiment. The data of the parameters N, Ra, t,V, w and θ of the photographing module 3000 and the plastic lens element300 b according to the 3rd embodiment of the present disclosure arelisted in the following Table 3.2, wherein the parameters are also shownas FIG. 3F and FIG. 3G. The definitions of these parameters shown inTable 3.2 are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment.

TABLE 3.2 Plastic Lens Element 300b of 3rd Embodiment N 6 V 20.4 Ra (μm)1.6~3.15 w (mm) 0.033 t (mm) 0.023 θ (deg.) 20

In addition, the object-side surface 301 b of the plastic lens element300 b includes an effective optical portion 311 b and a peripheralportion 321 b. The effective optical portion 311 b is aspheric. Theperipheral portion 321 b surrounds the effective optical portion 311 band includes a plurality of rib structures 331 b.

FIG. 3H is a schematic view of the object-side surface 301 b of theplastic lens element 300 b according to the 3rd embodiment. In FIG. 3Aand FIG. 3H, each of the rib structures 331 b has a strip shape along aradial direction of the optical axis of the imaging lens assembly 3100and is V-shaped, wherein the cross-section in the radial direction ofthe optical axis of each of the rib structures 331 b is a rectangle, therib structures 331 b are arranged around the effective optical portion311 b, and a number of the rib structures 331 b is 120.

Each of the rib structures 331 b includes a light diminishing surface333 b. The light diminishing surfaces 333 b are rough surfaces andtransferred from the laser related etching machining properties of themold surfaces during the injection molding process. Each of the lightdiminishing surfaces 333 b is located on all area of every surfaces ofeach of the rib structures 331 b.

In FIG. 3A, there is an air gap between the isolation section 342 a ofthe plastic lens element 300 a and the plastic lens element 300 b, whichis adjacent to the plastic lens element 300 a. When the image-sidesurface 302 a of the plastic lens element 300 a and the object-sidesurface 301 b of the plastic lens element 300 b include the ribstructures 332 a and 331 b respectively, the isolation section 342 a canprevent the lens elements 300 a and 300 b from collisions andinterference after assembling.

FIG. 3I is a schematic view of the parameter w of the object-sidesurface 301 b of the plastic lens element 300 b according to the 3rdembodiment. When a greatest width of each of the rib structures 331 b isw, the following condition is satisfied: w=0.036 mm.

4th Embodiment

FIG. 4A is a schematic view of a photographing module 4000 according tothe 4th embodiment of the present disclosure. In FIG. 4A, thephotographing module 4000 includes an imaging lens assembly 4100. Theimaging lens assembly 4100 includes a plurality of lens elements,wherein one of the lens elements is a plastic lens element 400, and atleast one surface of an object-side surface 401 and an image-sidesurface 402 of the plastic lens element 400 (the aforementioned surfaceis the object-side surface 401 in the 4th embodiment) includes aneffective optical portion 411 and a peripheral portion 421.

The effective optical portion 411 of the plastic lens element 400 isaspheric. The peripheral portion 421 surrounds the effective opticalportion 411, and includes a plurality of rib structures 431, a firstfitting section 451 and an isolation section 441.

FIG. 4B is a schematic view of the plastic lens element 400 according tothe 4th embodiment. In FIG. 4A and FIG. 4B, each of the rib structures431 has a strip shape along a radial direction of an optical axis of theimaging lens assembly 4100, wherein the cross-section in the radialdirection of the optical axis of each of the rib structures 431 is atriangle, and the rib structures 431 are arranged around the effectiveoptical portion 411.

In FIG. 4A, the first fitting section 451 surrounds the effectiveoptical portion 411, and is connected to a lens element 4101 adjacent tothe object-side surface 401 for aligning the plastic lens element 400with the lens element 4101. That is, the plastic lens element 400 andthe lens element 4101 can be aligned with the optical axis of theimaging lens assembly 4100.

The isolation section 441 is disposed between the rib structures 431 andthe first fitting section 451. There is an air gap between the isolationsection 441 and the lens element 4101, and there is another air gapbetween the isolation section 441 and a light blocking sheet 4191.

In the 4th embodiment, the imaging lens assembly 4100 includes, in orderfrom an object side to an image side, the lens elements 4101, theplastic lens element 400, lens elements 4102 and 4103, wherein theimaging lens assembly 4100 has a total of four lens elements, and theplastic lens element 400 is the second lens element of the imaging lensassembly 4100 in order from the object side to the image side.Furthermore, the imaging lens assembly 4100 of the photographing module4000 further includes the light blocking sheet 4191 disposed between theplastic lens element 400 and the lens element 4101, which is adjacent tothe plastic lens element 400.

In FIG. 4A, the other surface of the object-side surface 401 and theimage-side surface 402 of the plastic lens element 400 (theaforementioned the other surface is the image-side surface 402 in the4th embodiment) includes a second fitting section 452 connected to thelens element 4102, which is adjacent to the image-side surface 402, foraligning the plastic lens element 400 with the lens element 4102. Thatis, the plastic lens element 400 and the lens element 4102 can bealigned with the optical axis of the imaging lens assembly 4100. In the4th embodiment, the first fitting section 451 and the second fittingsection 452 are connected to the lens elements 4101 and 4102respectively for the lens element 4101, the plastic lens element 400 andthe lens element 4102 aligned with the optical axis of the imaging lensassembly 4100.

In FIG. 4A and FIG. 4B, the rib structures 431 is closer to theeffective optical portion 411 than the first fitting section 451. Anumber of the rib structures 431 is 180. The rib structures 431 aredivided into two groups, which are arranged in order along the radialdirection of the optical axis of the imaging lens assembly 4100. Thatis, one group being near the optical axis and the other group being farfrom the optical axis are separated by a bend of the peripheral portion421. A number of the rib structures 431 of each of the two groups is 90.

Each of the rib structures 431 includes a light diminishing surface 433.The light diminishing surfaces 433 are rough surfaces and transferredfrom the sand blasting machining properties of the mold surfaces duringthe injection molding process. Each of the light diminishing surfaces433 is located on all area of every surfaces of each of the ribstructures 431.

The isolation section 441 is a smooth surface, wherein the smoothness ofthe isolation section 441 is the same as or similar to the smoothness ofthe effective optical portion 411. Furthermore, the isolation section441 includes an annular surface 443, wherein a normal direction of theannular surface 443 is parallel to the optical axis of the imaging lensassembly 4100.

FIG. 4C is a schematic view of the parameter w of the plastic lenselement 400 according to the 4th embodiment, and FIG. 4D is a schematicview of the parameters t and θ of the plastic lens element 400 accordingto the 4th embodiment. The data of the parameters N, Ra, t, V, w and θof the photographing module 4000 according to the 4th embodiment of thepresent disclosure are listed in the following Table 4, wherein theparameters are also shown as FIG. 4C and FIG. 4D. The definitions ofthese parameters shown in Table 4 are the same as those stated in the1st embodiment with corresponding values for the 4th embodiment.

TABLE 4 4th Embodiment N 4 V 23.3 Ra (μm) 0.80~2.24 w (mm) 0.034 t (mm)0.016 θ (deg.) 20

5th Embodiment

FIG. 5 shows an electronic device 50 according to the 5th embodiment ofthe present disclosure. The electronic device 50 of the 5th embodimentis a smart phone, wherein the electronic device 50 includes aphotographing module 5000 according to the present disclosure.Therefore, it is favorable for simultaneously suppressing the straylight and enhancing alignment precision with the optical axis so as toimprove the image quality and satisfy the requirements of high-endelectronic devices with camera functionalities. Furthermore, theelectronic device 50 can further include an image sensor (not shownherein) disposed on or near an image surface of the photographing module5000. Preferably, the electronic device 50 can further include but notlimited to a display, a control unit, a storage unit, a random accessmemory unit (RAM), a read-only memory unit (ROM) or a combinationthereof.

6th Embodiment

FIG. 6 shows an electronic device 60 according to the 6th embodiment ofthe present disclosure. The electronic device 60 of the 6th embodimentis a tablet personal computer, wherein the electronic device 60 includesa photographing module 6000 according to the present disclosure.

7th Embodiment

FIG. 7 shows an electronic device 70 according to the 7th embodiment ofthe present disclosure. The electronic device 70 of the 7th embodimentis a wearable device, wherein the electronic device 70 includes aphotographing lens module 7000 according to the present disclosure.

Although the present disclosure has been described in considerabledetail with reference to the embodiments thereof, other embodiments arepossible. Therefore, the spirit and scope of the appended claims shouldnot be limited to the description of the embodiments contained herein.It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentdisclosure without departing from the scope or spirit of the presentdisclosure. In view of the foregoing, it is intended that the presentdisclosure cover modifications and variations of this disclosureprovided they fall within the scope of the following claims.

What is claimed is:
 1. A photographing module, comprising: an imaginglens assembly comprising a plurality of lens elements, wherein one ofthe lens elements is a plastic lens element, and at least one surface ofan object-side surface and an image-side surface of the plastic lenselement comprises: an effective optical portion being aspheric; and aperipheral portion surrounding the effective optical portion andcomprising: a plurality of rib structures, wherein each of the ribstructures has a strip shape along a radial direction of an optical axisof the imaging lens assembly and is inclined relative to the opticalaxis, two of the rib structures in one of the radial directionsseparately face each other, and the strip shapes of the rib structuresare arranged around the effective optical portion; wherein each of thestrip shapes is parallel with one of the radial directions.
 2. Thephotographing module of claim 1, wherein the imaging lens assemblyfurther comprises: a light blocking sheet disposed between the plasticlens element and the lens element adjacent to the surface.
 3. Thephotographing module of claim 1, wherein a number of the lens elementsof the imaging lens assembly is N, and the following condition issatisfied: 4≤N.
 4. The photographing module of claim 1, wherein an Abbenumber of the plastic lens element is V, and the following condition issatisfied: 10<V<25.
 5. The photographing module of claim 1, wherein agreatest width of each of the strip shapes is w, and the followingcondition is satisfied: 0.01 mm<w<0.10 mm.
 6. The photographing moduleof claim 1, wherein the other surface of the object-side surface and theimage-side surface of the plastic lens element comprises: a secondfitting section connected to another one of the lens elements adjacentto the other surface for aligning the plastic lens element with the lenselement adjacent to the other surface.
 7. The photographing module ofclaim 2, wherein a thickness of the light blocking sheet is t, and thefollowing condition is satisfied: 0.005 mm<t<0.05 mm.
 8. Thephotographing module of claim 3, wherein the number of the lens elementsof the imaging lens assembly is N, and the following condition issatisfied: 5≤N.
 9. The photographing module of claim 8, wherein thenumber of the lens elements of the imaging lens assembly is N, and thefollowing condition is satisfied: 5≤N<10.
 10. An electronic device,comprising: the photographing module of claim 1.